A．People playing games make decisions much faster than most people．
B．People playing games can focus on more things at once than common people．
C．People playing games often get confused when focusing on many things at once．
D．People playing games prefer to sell video and computer games．
A．They may influence players' brain activity in emotional control．
B．They may result in the overweight of players．
C．They may promote players' creativity and perception．
D．They may help players to focus on more things at once．
A．It can change a person's life．
B．It is suitable for the ambitious people．
C．It can never be learned at school．
D．It is especially helpful for adults．